|
Motivated by the discovery of a repeating FRB associated with a globular cluster in the nearby galaxy M81, this thesis investigates whether old stellar environments can produce FRBs and examines the relationship between FRBs and other coherent radio transients associated with neutron stars. Using MeerKAT ultra-high frequency baseband observations of the millisecond pulsar PSR~J1823$-$3021A in the globular cluster NGC~6624, we detect more than $3.7\times10^{4}$ GPs per hour, establishing it as one of the most prolific GP emitters known. Although the pulses exhibit complex temporal and spectral structures, their energetics, periodicity, and statistical properties distinguish them from FRBs, suggesting that GPs are unlikely to be direct low-energy analogues of the FRB population. We also investigate scintillation and coherent descattering, demonstrating the feasibility of recovering intrinsic pulse structures from highly scattered radio pulses. Extending this work to extragalactic systems, we conduct a deep FAST search for FRBs from globular clusters in the nearby elliptical galaxy M49 (NGC~4472), covering $\sim4000$ globular clusters. No FRBs are conclusively detected, yielding stringent upper limits on FRB activity in globular clusters. Finally, we explore the cosmological potential of future wide-field FRB surveys with the BURSTT experiment, showing that large FRB samples could constrain primordial black holes through gravitational lensing.
|
|